You can both take a bus or drive down to Yelagiri. Yelagiri is well connected by Road from Ponneri. Regular bus services are available from cities like Tiruoathur, Bangalore, Chennai, Krishnagiri and Vanayambadi. You can also drive down from Bangalore, Chennai and Coimbatore. From Bangalore, you have to take the NH 7 towards Krishnagiri, from Chennai you will have to take the NH 4 and head towards Vellore and from Coimbatore you can take the NH 47 to Salem and then arrive at Krishnagiri.